非诚勿扰非礼勿视
[fēi chéng wù răo fēi lĭ wù shì]
Literally 'Do Not Disturb Unless Sincere; Do Not See If Impolite'. It sets personal boundaries, insisting people treat themselves respectfully and seriously. It could also be a gentle rejection, a hint that the user is looking for serious intentions rather than casual interactions.